Drilling-machine



W. T. SEARS.

DRILLING MACHINE.

APPLICATION FILED DEC. 12. I917.

Patented Feb. 15,1921.

' 3 SHEETS-SHEE] 1.

INVENTOR Wan/w ,wf T966 W. T. SEARS.

DRILLING MACHINE. APPLICATION FILED Dgc. 12. 1911.

- Patented Feb. 15, 1921.

3 SHEETSSHEET 2.

INVENTOR Jim 1 RNEY W. T. SEARS.

DRILLING MACHINE. 1,368,294 APPlyJCATlON FILED oc. 12. 1911. Patented Feb. 15 1921' 3 SHEETSSHEET 3.

UNITED STATES PATENT OFFICE.

WILLARD 'r. SEARS, or BROOKLYN, NEW YORK, ASSIGNOR T0 NILES-BEMENT-POND COMPANY, OF NEW YORK, N. A CORPORATION OF NEW JERSEY.

DRILLING-MACHINE.

Specification of Letters Patent.

Patented Feb. 15, 1921.

Application filed December 12, 1917. Serial No. 206,780.

To all whom it may concern:

Be it known that I, WILLARD T. SnARs, a citizen of the United States, residlng at Brooklyn, in the county of Kings and State of New York, have invented certaln new and useful Improvements, in Drilling-Machines, of which the following is a specification.

The object of the invention is to provide an improved construction which permits the spindle of the machine to be placed relatively close to the horizontal arm shaft, thus minimizing the torsional stresses in the arm and securing other advantages. One fea ture which enables me to reduce the distance between the spindle and the arm shaft is an improved mechanism for transmittlng power from the shaft to the spmdle Another feature which is advantageous 1n reducing the said distance, when an'angularly adjustable spindle head is provided, lsan improved worm and gear mechanism foradjusting the head.

In the accompanying drawlngs I have shown my invention embodied in a universal radial drill but it will be understood that the invention can be otherwise embodied and that the drawings are not to be construed as defining or limiting the scope of the invention, the accompanylng claims being relied upon for that purpose.

Of the drawings:

Figure 1 is a side view of a radlal dr1ll embodying the invention.

Fig. 2 is a front view.

Fig. 3 is a fragmentary sectlonal v1ew taken along the line 33 of F 1g. 5.

Fig. 4 is a fragmentary vertical sectional view taken along the line 4-4 of Fig.

Fig. 5 is a vertical transverse sectional view taken through the arm and the spindle.

Referring to the drawings, 1 represents the column and 2 the horizontal arm which is vertically adjustable with respect to the column. I have illustrated a.-d1v1ded column such as shown in my 1,071,590 dated August 26th, 1913, but, so far as my present invention is concerned, a column of different form might be used.

Extending longitudinally of the arm 2 1s a driving member comprising a power shaft 3 mounted in bearings at the ends of the arm. For driving the shaft 3 I have illustrated a mechanism similar to that set forth in my aforesaid patent, this consisting of an electric motor 4 Patent which is mounted at the rear slde of the column. The motor is carried by a connecting piece 5 which extends through the column between the two sections thereof and which also carries the arm 2. The shaft 3 extends throu h the column and, preferably, suitable changespeed gearmg is contained within a casing 6 whereby the speed ratio between the motor shaft and the driving shaft 3 may be yaried. The arm 2 may have a swiveled connection with the connecting piece 5 whereby it may be turned about .the axis of the shaft 3; but this \connection may be omitted as it constitutes no part of my present invention.

' Mounted on the arm 2 is a head 13 which is preferably carried by a saddle 7 slidable along the arm. Preferably the arm has two guideways 8 and 9 which are outof vertical alinement with each, other, as set forth in my Patent 1,098,981 dated June 2nd, 1914. The saddle is shaped to engage these two non-alined guideways. The saddle may be rack 11 on the arm. A hand wheel 12 is connected with the pinion 10 for turning it. The head 13 is preferably capable of angular adjustment with respect to the sad dle about a transverse horizontal axis. The head-1s guided by an annular tongue 14 fitting an annular groove in the saddle. ,Rotatably mounted in a bearing of the head 13 is a sleeve 15 carrying at' its upper or inner end a bevel gear 16, the gear and the sleeve preferably being formed integrally, as shown. Mounted within the sleeve 15 and splined thereto is adrill spindle member 17 The drilling tool can be connected to the spindle in the usual way. The spindle also has a bearing in the head at 18.

Secured to the rear of the saddle is a bracket 19 provided with bearings 20 and 21.

moved along the arm by means. of a pinion 10 on the saddle engaging a Fitted within the bearing 20 is a sleeve 22 having a bevel gear 23 connected to it and preferably formed integrally therewith.

.The sleeve 22 surrounds and is splined to I make use of improved means for transmitting power from the bevel gear 23 on the bevel gear on the spindle. The'transverse horizontal shaft was supported by an external bearing positioned between the two bevel gears. In order 'to provide sufiicient bearing surface, the two bevel gears were necessarily quite widely .sepa'rated, thus making it necessary to locate the spindle at a considerable distance from the arm shaft.f

This has been objectionable as it causeda considerable torsional stress in the arm due to-the longitudinal drilling pressure on the spindle.

In accordance with my invention I avoid the difiiculties befortkenumerated by providing a supporting means preferably in the form of an internal carrier for the intermediate bevel gears, which consists of a pin supported at both ends. In this way I avoid any bearing located between the bevel gears and I am thus enabled to place the two sets of teeth of the said gears close together. In.

fact, the two sets of teeth can advantageously be formed on the same gear, which thus constitutes a doublebevel gear. I preferably mount the .ends of the'pin non-rotatably in the head and saddle and adapt the bevel gear structure to have its rotative bearing on the pin. It will be evident that such non-rotative mounting of the ends fthe in may be made more easily and, shorter ength than could bearings mounting the pin rotatably. By this construction I secure-the maximum rotative bearing length for the gear structure on the pin. Since the space between the drive shaft 3 and spindle 17 is so limited, I prefer to support the ends of the pin in the manner hereinafter described rather than to place both end-supports there: of between the drive shaft and spindle. As illustrated a transverse horizontal yoke 24 is provided at its ends with trunnions which are seated respectively in apertures formed in the bracket 19 and in the body ,part' of the head-13, the'common axis of these trunnions bein coincident with the axis of swiveling of t e head. The yoke is provided with an opening through which the shaft 3 extends. The front part of the yoke is in the form of a bearing pin 24 which serves as a support for a bevel gear structure 25 having two sets of teeth meshing respectively with the bevel gear 23 and the bevel gear 16. By preference, these two sets of bevel gear teeth are formed on the same gear, which is designated in the drawings by 25, but it will be understood that my invention, in its broader aspects, is not so limited. It will be seen that when the shaft case.

Leeann.

3 is rotated motion will be transmitted from the bevel gear 23 to the bevel gear 25 and that from the gear 25 motion will be transmitted to the-gear 16 and thence to the.

nection. The provision of the double-faced bevel gear 25 with the internal carrier therefor, enables the distance between the spindle 1 7 and the arm shaft 3 to be reduced to a minimum.

When an angularly adjustable head 13 is rovid'ed, as shown,- I provide novel means or adjusting it and for securing it in ad-' usted position. This means is so constructedas to enable the head with the spindle to be placed 'atthe minimum distance from the arm and the arm shaft. Carried by the head 13 is a circular seriesof worm gear teeth I 25 which face rearward. Preferably these teeth are formed on a ring 25* secured to the head-go The teeth 25 mesh with a worm 25 on a'vertical shaft 25 The lower end of the shaft is squared, as shown in Fig. 1, to enable it to be readily turned. It will be seen that by turning the shaft the worm 25 will be caused to move the ring 25 and thus turn the head 13. The worm serves as automatic locking-means to hold the ring 25 and the head 13 in adjusted positions. The arrangement {of the teeth .25 so. that they face rearward enables me to reduce the space allotted to them and to locate the worm chiefly within the outlines of the saddle 7. If the worm teeth were located on the periphery of the ring 25 the ring would have to be relatively thick and the worm would have*to be positioned between the saddle and the head. The thicker ring and the location of the worm between the saddle and the head wouldmake it necessary for the head to be laced much farther away from the arm an .the armshaft than is now the Suitable means is provided for moving the spindle 17 longitudinally to position the drilling tool with respect to the work or to feed it or withdraw it. This means does not of itself constitute a part of my present invention and a very brief description will be suflicient. As illustrated, the spindle 17 is connected at its upper end with a non-rotatable rod or sleeve 26 which is provided with rack teeth 27. The teeth 27 mesh with a pinion 28 which is connected with a bevel gear 29. A bevel pinion 30 is secured to an aeeaeet inclined feed shaft 31 and meshes with the gear 30. At the lower end of the shaft 31 is a handle 32 by means of which the shaft can be turned, thus rotating the gears 29 and 28 and raising or lowering the spindle.

in order that the spindle may be moved by power to effect feeding, there is provided a bevel gear 33 connected with the bevel gear 16. This bevel .gear 33 meshes with a bevel gear 34 on a longitudinal shaft 35. Changespeed gearing 36 connects the shaft 35with a longitudinal shaft 37, preferably through a jaw clutch 38. The gearing can be adjusted by means of a hand lever 39 and the clutch 38 can be engaged or disengaged by means of a hand lever 40. The shaft 37 carries a'worm 41 which meshes with a worm wheel 42 rotatably mounted on the shaft 31. Associated with the worm wheel 42 is a friction clutch 43, the driven element of which is also rotatable on the shaft 31. The clutch 43 can be engaged or disengaged by moving the handle 32 about a pivotal axis at 44. The driven element of the clutch 43 is connected with the" shaft 31 by means of suitable reduction gearing indicated at 45. It will be seen that, when the clutches 38 and 43 are engaged, power will be transmitted, through the connections described, from the gear 33 to the shaft 31 which is slowly rotated. From the shaft 31 longitudinal feeding movement is transmitted to the spindle in the way already described. The rate of feeding can be varied by adjusting the gearing at 36.

Preferably there is provided a counterweight 46 for the spindle and associated parts. As illustrated, the counterweight is provided with rack teeth 47 which mesh with an idler gear 48, the idler gear in turn meshing with a pinion 49 connected with the gears 28 and 29. It will be seen that the counterweight tends to rotate the gear 28 in the counter-clockwise direction, as viewed in Fig. 5, thus tending to lift thespindle,

What I claim is: r

1. The combination in a drilling machine, of a horizontal arm, a head carried by the arm and movable longitudinally therealong, a drive shaft extending longitudinally of the arm, a bevel gear on the shaft, a spindle rotatably mounted in the head, a bevel gear on the spindle, two closely adjacent sets of bevel gear teeth mounted directly between and closely adjacent the drive shaft and the spindle and meshing respectively with the bevel gear on the shaft and the bevel car on the spindle, and an internal carrier or the sets of teeth consisting of a pin supported at one end on the head and at the other end spanning the drive shaft and supported on the saddle at the other side of the drive shaft, the close arrangement of the two sets ofbevel gear teeth and their cooperating parts being such that the spindle is positioned closely adjacent the arm and drive shaft.

2. The combination in a drilling machine, of a horizontal arm, a head earned by the arm and movable longitudinally therealong, a drive shaft member extending longitudinally of the arm, a bevel gear on the shaft, a spindle member rotatably mounted in the head, a bevel gear on the spindle, two closely adjacent sets of bevel gear teeth mounted directly between and closely adjacent the of a horizontal arm, a saddle movable along the arm, a head swiveled to the saddle formovement about a transverse'horizontal axis, a drive shaft member extending longitudinally of the arm, a bevel gear splined to the shaft and movable with the saddle, a spindle member rotatably mounted in the head, a

bevel gear on the spindle, two closely adjacent sets of bevel gear teeth mounted directly between and closely adjacent the drive shaft and the spindle, rotatable about the axis of movement of the head and meshing respectively with the bevel gear on the shaft and the bevel gear on the spindle, and an endsupported bearing pin spanning one of the said members and supporting the said sets of bevel gear teeth, the close arrangement of the two sets of bevel gear teeth and their cooperating parts being such that the spindle is positioned closely adjacent the arm and drive shaft.

4. The combination in a drilling machine, of a horizontal arm, a saddle movable along the arm, a head swiveled to the saddle for movement about a transverse horizontal axis, a drive shaft extending longitudinally of the arm, a bevel gear splined to the shaft and movable with the saddle, a spindle rotatably mounted in the head, a bevel gear on the spindle, two closely adjacent sets of bevel gear teeth mounted directly between and closely adjacent the drive shaft and the spindle, rotatable about the axis of movement of the head and meshing respectively with the bevel gear on the shaft and the bevel gear on the spindle, and a nonrotatable end-supported bearing pin for the saidsets of bevel gear teeth supported at one end on the saddle and at the other end on the head at the swivel axis thereof, the

close arrangement of the two sets of bevel of a horizontal arm, a saddle movable along the arm, a head swiveled to the saddle for movement about a transverse horizontal axis, a drive shaft extending longitudinally of the arm, a bevel gear splined to the shaft and movable with the saddle, a spindle rotatably mounted in the head, a bevel gear on the spindle, two closely adjacent sets of the saddle and at the other side on the head at the swivel axis thereof, the close arrangement of the two sets of bevel gearteeth and,their cooperating parts being such that the spindle is positioned closely ad acent the arm and the drive shaft.

6. The combination in a drilling machine, of a horizontal arm, a saddle movable along the arm, a head swiveled to the saddle for movement about a transverse horizontal axis, a drive shaft extending longitudinally of the arm, a bevel gear splined to the shaft and movable with the saddle, a splndle rotatably mounted in the head, a bevel gear on the spindle, two closely adjacent sets of bevel gear teeth rotatable about the swlvel axis of the head and meshing respectively with the bevel gear on the shaft and the bevel gear on the s indle, and an internal bearing yoke for t e sets of bevel gear teeth supported at one. end on the head at the swivel axis, and at the other end spanning the drive shaft and supported on the saddle at the other side of the drlve shaft.

7. The combination in a drilling machine of a horizontal arm, a head carried by the arm and movable longitudinally therealong, a drive shaft member extending longitudinally of the arm, a bevel gear on the shaft, a spindle member rotatably mounted in the head, a bevel gear on the spindle, a third integral bevel gear mounted directly between and closely adjacent the dr1ve shaft and the spindle and having closely ad acent sets of teeth meshing respectively with the bevel gear on the shaft and the bevel gear onthe spindle, and an internal carrler for the third bevel gear consisting of a pm spanning oneof the said members and supporting the said integral bevel gear, the close arrangement of the Integral sets of bevel gear teeth and of thelr cooperatmg parts being such that the spindle is positioned closely'adjacent the arm and dI1V6 shaft.

the said outer face of the saddle sufficiently to engage the worm teeth on the head.

9. The combination in a drilling machine, of a horizontal arm, a saddle longitudinally movable along the arm, a head carried by the saddle at the front thereof and movable about a transverse horizontal axis, a drive shaft extending longitudinally of the arm,

a spindle rotatably mounted in the head, gearing between the shaft and the spindle, a gear ring mounted on the head between the saddle and head and having a series of rearward facing worm teeth, the said gear ring being-in direct engagement with the body part of the head and with the saddle, and'a rotatable worm mounted on the saddle and meshing with the 'worm teeth of the ring, the thickness of the said ring being less than the length of the teeth.

10. The combination in a drilling machine', of a horizontal arm, a saddle movable along the arm, a head mounted on the saddle at the front thereof and movable about a transverse horizontal axis, a drive shaft extending longitudinally of the arm, a bevel gear splined to the shaft and movable with the saddle, a spindle rotatably mounted in the head, a bevel gear on the spindle, two closely adjacent sets of bevel ear teeth mounted between and closely ad jacent the drive shaft and the spindle, r0-

tatable about the axis of movement of the head and .meshing respectively with the bevel gear on the shaft and the bevel gear on the spindle, an internal carrier for the sets of teeth, a circular series of "rearward facing worm teeth carried by the head closely adjacent the outer face of the saddle, and a rotatable worm mounted in the saddle and meshing with the worm teeth, the close arrangement of the spindle and head operating mechanisms being such that the spindle is positioned closely adjacent the arm and drive shaft.

In testimony whereof, I hereto afiix my signature.

WILLARD T. SEARS. 

